chrono::geometry::ChLineBspline Class Reference

Description

Geometric object representing a Bspline spline.

#include <ChLineBspline.h>

Inheritance diagram for chrono::geometry::ChLineBspline:
Collaboration diagram for chrono::geometry::ChLineBspline:

Public Member Functions

 ChLineBspline ()
 Constructor. By default, a segment (order = 1, two points on X axis, at -1, +1)
 
 ChLineBspline (int morder, const std::vector< ChVector<> > &mpoints, ChVectorDynamic<> *mknots=0)
 Constructor from a given array of control points. More...
 
 ChLineBspline (const ChLineBspline &source)
 
virtual ChLineBsplineClone () const override
 "Virtual" copy constructor (covariant return type).
 
virtual int Get_complexity () const override
 Tell the complexity.
 
virtual ChVector Evaluate (double U) const override
 Return a point on the line, given parametric coordinate U (in [0,1]).
 
virtual ChVector GetTangent (double parU) const override
 Return the tangent unit vector at the parametric coordinate U (in [0,1]).
 
double ComputeUfromKnotU (double u) const
 When using Evaluate() etc. More...
 
double ComputeKnotUfromU (double U) const
 When using Evaluate() etc. More...
 
std::vector< ChVector<> > & Points ()
 Access the points.
 
ChVectorDynamicKnots ()
 Access the knots.
 
int GetOrder ()
 Get the order of spline.
 
virtual void SetupData (int morder, const std::vector< ChVector<> > &mpoints, ChVectorDynamic<> *mknots=0)
 Initial easy setup from a given array of control points. More...
 
void SetClosed (bool mc)
 Set as closed spline: start and end will overlap at 0 and 1 abscyssa as p(0)=p(1), and the Evaluate() and GetTangent() functions will operate in periodic way (abscyssa greater than 1 or smaller than 0 will wrap to 0..1 range). More...
 
bool GetClosed ()
 Tell if the spline is closed.
 
virtual void ArchiveOut (ChArchiveOut &marchive) override
 Method to allow serialization of transient data to archives.
 
virtual void ArchiveIn (ChArchiveIn &marchive) override
 Method to allow de-serialization of transient data from archives.
 
- Public Member Functions inherited from chrono::geometry::ChLine
 ChLine (const ChLine &source)
 
virtual Type GetClassType () const override
 "Virtual" copy constructor (covariant return type). More...
 
virtual bool Get_closed () const
 Tell if the curve is closed.
 
virtual void Set_closed (bool mc)
 
virtual void Set_complexity (int mc)
 
virtual int GetManifoldDimension () const override
 This is a line.
 
bool FindNearestLinePoint (ChVector<> &point, double &resU, double approxU, double tol) const
 Find the parameter resU for the nearest point on curve to "point".
 
virtual double Length (int sampling) const
 Returns curve length. Typical sampling 1..5 (1 already gives correct result with degree1 curves)
 
virtual ChVector GetEndA () const
 Return the start point of the line. More...
 
virtual ChVector GetEndB () const
 Return the end point of the line. More...
 
double CurveCurveDist (ChLine *compline, int samples) const
 Returns adimensional information on "how much" this curve is similar to another in its overall shape (does not matter parametrization or start point). More...
 
double CurveSegmentDist (ChLine *complinesegm, int samples) const
 Same as before, but returns "how near" is complinesegm to whatever segment of this line (does not matter the percentual of line). More...
 
double CurveCurveDistMax (ChLine *compline, int samples) const
 Same as above, but instead of making average of the distances, these functions return the maximum of the distances...
 
double CurveSegmentDistMax (ChLine *complinesegm, int samples) const
 
virtual bool DrawPostscript (ChFile_ps *mfle, int markpoints, int bezier_interpolate)
 Draw into the current graph viewport of a ChFile_ps file.
 
- Public Member Functions inherited from chrono::geometry::ChGeometry
 ChGeometry (const ChGeometry &source)
 
virtual ChAABB GetBoundingBox () const
 Compute bounding box along the directions of the shape definition frame. More...
 
void InflateBoundingBox (ChAABB &bbox) const
 Enlarge the given existing bounding box with the bounding box of this object.
 
virtual double GetBoundingSphereRadius () const
 Returns the radius of a bounding sphere for this geometry. More...
 
virtual ChVector Baricenter () const
 Compute center of mass.
 
virtual void Update ()
 Generic update of internal data.
 

Public Attributes

std::vector< ChVector<> > points
 
ChVectorDynamic knots
 
int p
 
bool closed
 

Additional Inherited Members

- Public Types inherited from chrono::geometry::ChGeometry
enum  Type {
  NONE, SPHERE, ELLIPSOID, BOX,
  CYLINDER, TRIANGLE, CAPSULE, CONE,
  LINE, LINE_ARC, LINE_BEZIER, LINE_CAM,
  LINE_PATH, LINE_POLY, LINE_SEGMENT, ROUNDED_BOX,
  ROUNDED_CYLINDER, TRIANGLEMESH, TRIANGLEMESH_CONNECTED, TRIANGLEMESH_SOUP
}
 Enumeration of geometric object types.
 
- Protected Attributes inherited from chrono::geometry::ChLine
bool closed
 
int complexityU
 

Constructor & Destructor Documentation

◆ ChLineBspline()

chrono::geometry::ChLineBspline::ChLineBspline ( int  morder,
const std::vector< ChVector<> > &  mpoints,
ChVectorDynamic<> *  mknots = 0 
)

Constructor from a given array of control points.

Input data is copied. If the knots are not provided, a uniformly spaced knot vector is made.

Parameters
morderorder p: 1= linear, 2=quadratic, etc.
mpointscontrol points, size n. Required: at least n >= p+1
mknotsknots, size k. Required k=n+p+1. If not provided, initialized to uniform.

Member Function Documentation

◆ ComputeKnotUfromU()

double chrono::geometry::ChLineBspline::ComputeKnotUfromU ( double  U) const
inline

When using Evaluate() etc.

you need U parameter to be in 0..1 range, but knot range is not necessarily in 0..1. So you can convert U->u, where u is in knot range, calling this:

◆ ComputeUfromKnotU()

double chrono::geometry::ChLineBspline::ComputeUfromKnotU ( double  u) const
inline

When using Evaluate() etc.

you need U parameter to be in 0..1 range, but knot range is not necessarily in 0..1. So you can convert u->U, where u is in knot range, calling this:

◆ SetClosed()

void chrono::geometry::ChLineBspline::SetClosed ( bool  mc)

Set as closed spline: start and end will overlap at 0 and 1 abscyssa as p(0)=p(1), and the Evaluate() and GetTangent() functions will operate in periodic way (abscyssa greater than 1 or smaller than 0 will wrap to 0..1 range).

The closure will change the knot vector (multiple start end knots will be lost) and will create auxiliary p control points at the end that will be wrapped to the beginning control point.

◆ SetupData()

void chrono::geometry::ChLineBspline::SetupData ( int  morder,
const std::vector< ChVector<> > &  mpoints,
ChVectorDynamic<> *  mknots = 0 
)
virtual

Initial easy setup from a given array of control points.

Input data is copied. If the knots are not provided, a uniformly spaced knot vector is made.

Parameters
morderorder p: 1= linear, 2=quadratic, etc.
mpointscontrol points, size n. Required: at least n >= p+1
mknotsknots, size k. Required k=n+p+1. If not provided, initialized to uniform.

The documentation for this class was generated from the following files:
  • /builds/uwsbel/chrono/src/chrono/geometry/ChLineBspline.h
  • /builds/uwsbel/chrono/src/chrono/geometry/ChLineBspline.cpp